The merits of biamping really depends on the types of speakers you have. In my case, I have Vandersteen 3A Signatures and I am bi-amping with two Mark Levinson 331's (as recommended by Richard Vandersteen). I believe that the speakers sound much better than when I just had them bi-wired. This is also understandable because the load that each amplifier sees is much simpler. However, it should be remembered that you will need more than just aother stereo amplifier, but another pair of speaker cables and interconnects as well (duh). This can be a very expensive proposition. It really depends on the crossovers in the speaker systems.
BI-AMPING
BI-AMPING IS THE TRUE WAY TO REALLY GOOD SOUND THE X-OVERS IN PRETTY MUCH ALL SPEAKERS OVERLOAD DISTORTING THE SIGNAL. ACTUALLY, ALL SPEAKER REVIEWS AND RATINGS ARE WORTHLESS UNLESS THEY ARE BI-AMPING,THEY ARE MERELY REPORTING THE COLORATIONS AND DISTORTIONS IN THE PASSIVE X-OVERS. CONSIDER THIS, BI-AMPING AND TRI-AMPING ARE THE INDUSTRY STANDARD IN RECORDED AND LIVE SOUND. SO, WOULDN'T IT MAKE SENSE FOR YOU TO DO THE SAME IN YOUR LISTENING ROOM/STUDIO? AS FAR AS UNITS THAT I WOULD RECOMMEND, FOR A DECENT PRICE THE BRYSTON 10B, IF YOU WANT TO AND CAN AFFORD IT, THE FM ACOUSTICS 236. SOME OF YOU MIGHT SAY THAT THE X-OVER (EVEN THE BEST UNITS SUCH AS THESE) COLORS THE SOUND, BUT REALLY, THE ADVANTAGES OUTWEIGH THE DISADVANTAGES. EACH DRIVER IS DRIVEN BY IT'S OWN AMP-DIRECT SIGNAL, YOU CAN'T BEAT THAT. I FEEL THAT THIS IS AN OVERLOOKED ISSUE THAT IS HORRENDOUSLY IGNORED BY THE PRESS AND THE PUBLIC ALIKE. YOU'RE A LOT BETTER OFF PAYING FOR ANOTHER STEREO AMP AND AN ACTIVE X-OVER THAN TRICK CABLES, SHUN MOOK CRAP, ROOM TUNES, CONES, DOMES, MARKERS, POWER LINE CONDITIONERS, AND ALL THAT OTHER very expensive GARBAGE THAT IS A BIG WASTE OF YOUR MONEY AND IS NOT EFFECTIVE. IF YOU DON'T BELEIVE ME ASK TOP DESIGNERS LIKE CHRIS RUSSELL OF BRYSTON, AT HEAR WHAT THEY TELL YOU.